Fix attachments endpoint

[tylerjmchugh]

#9443 introduced a new method approvedCopyExists to check if the requested version exists. The logic seems to have a bug though as it first checks the working copy repository. So if there is a working copy approvedCopyExists always returns false even if there is an approved copy as well.

This PR aims to fix this issue by instead checking the regular metadata repository first as this is where the approved copy would be.

Checklist

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• Good housekeeping of code, cleaning up comments, tests, and documentation
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• Library management using pom.xml dependency management. Update build documentation with intended library use and library tutorials or documentation

[josegar74]

@tylerjmchugh changes look fine, can you check this updated test file and include the changes?

AbstractStoreApprovedResolutionTest.java

[tylerjmchugh]

@tylerjmchugh changes look fine, can you check this updated test file and include the changes?

AbstractStoreApprovedResolutionTest.java

Thank you. Updated the test in the latest push.